Applying it's concept, it is found that the rate of change for the price of a pie from 2006 to 2010 is of $2 a year.
It is given by the change in the output divided by the change in the input.
In this problem, in 4 years, from 2006 to 2010, the price increased $8, from $9.50 to $17.50. Hence, the rate of change is given by:
r = 8/4 = 2.
Thus, the rate of change for the price of a pie from 2006 to 2010 is of $2 a year.
More can be learned about the rate of change at https://brainly.com/question/24313700